/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.validation;

import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;

/**
 * Encapsulates a field error, that is, a reason for rejecting a specific
 * field value.
 *
 * <p>See the {@link DefaultMessageCodesResolver} javadoc for details on
 * how a message code list is built for a {@code FieldError}.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @see DefaultMessageCodesResolver
 * @since 10.03.2003
 */
@SuppressWarnings("serial")
public class FieldError extends ObjectError {

    private final String field;

    @Nullable
    private final Object rejectedValue;

    private final boolean bindingFailure;


    /**
     * Create a new FieldError instance.
     *
     * @param objectName     the name of the affected object
     * @param field          the affected field of the object
     * @param defaultMessage the default message to be used to resolve this message
     */
    public FieldError(String objectName, String field, String defaultMessage) {
        this(objectName, field, null, false, null, null, defaultMessage);
    }

    /**
     * Create a new FieldError instance.
     *
     * @param objectName     the name of the affected object
     * @param field          the affected field of the object
     * @param rejectedValue  the rejected field value
     * @param bindingFailure whether this error represents a binding failure
     *                       (like a type mismatch); else, it is a validation failure
     * @param codes          the codes to be used to resolve this message
     * @param arguments      the array of arguments to be used to resolve this message
     * @param defaultMessage the default message to be used to resolve this message
     */
    public FieldError(String objectName, String field, @Nullable Object rejectedValue, boolean bindingFailure,
                      @Nullable String[] codes, @Nullable Object[] arguments, @Nullable String defaultMessage) {

        super(objectName, codes, arguments, defaultMessage);
        Assert.notNull(field, "Field must not be null");
        this.field = field;
        this.rejectedValue = rejectedValue;
        this.bindingFailure = bindingFailure;
    }


    /**
     * Return the affected field of the object.
     */
    public String getField() {
        return this.field;
    }

    /**
     * Return the rejected field value.
     */
    @Nullable
    public Object getRejectedValue() {
        return this.rejectedValue;
    }

    /**
     * Return whether this error represents a binding failure
     * (like a type mismatch); otherwise it is a validation failure.
     */
    public boolean isBindingFailure() {
        return this.bindingFailure;
    }


    @Override
    public boolean equals(@Nullable Object other) {
        if (this == other) {
            return true;
        }
        if (!super.equals(other)) {
            return false;
        }
        FieldError otherError = (FieldError) other;
        return (getField().equals(otherError.getField()) &&
                ObjectUtils.nullSafeEquals(getRejectedValue(), otherError.getRejectedValue()) &&
                isBindingFailure() == otherError.isBindingFailure());
    }

    @Override
    public int hashCode() {
        int hashCode = super.hashCode();
        hashCode = 29 * hashCode + getField().hashCode();
        hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(getRejectedValue());
        hashCode = 29 * hashCode + (isBindingFailure() ? 1 : 0);
        return hashCode;
    }

    @Override
    public String toString() {
        return "Field error in object '" + getObjectName() + "' on field '" + this.field +
                "': rejected value [" + ObjectUtils.nullSafeToString(this.rejectedValue) + "]; " +
                resolvableToString();
    }

}
